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Thread: make carpc go to sleep if using the DC-AC-DC method?

  1. #1
    Variable Bitrate
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    make carpc go to sleep if using the DC-AC-DC method?

    hey forum. i want to find a way, to make my car pc go to sleep mode.. the thing is, i am using an inverter to create 220v, and then a normal desktop PSU to power my pc... of course, i cant leave the inverter on, becouse it will consume like 100 times more than the pc when it sleeps..

    i know that the sort answer to this, is "get a dc-dc PSU" , but i really dont want to. i have tried it in the past, and always with bad outcomes, mainly becouse the "inteligent" PSU's, are dumb as ****. also, lets take as a fact, that the enviroment in m ycar, dosent support a dc-dc PSU.

    so... in the DC-AC-DC build... how could do this??
    i do bealive it can't be done, but i have nothing to loose for asking

  2. #2
    Constant Bitrate eugenweij's Avatar
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    sleep will be a problem as you said, the inverter consumes way to much power , however hibernate is an option.

    You will need to build/buy a relay so the inverter shuts off about minute after you turn off ignition or the hibernate procedure will be cut off before its finished.
    View my worklog here

  3. #3
    Raw Wave
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    Yep - a relay ideally controlled by some PC output (eg - PC PSU 12V), plus the initial "boot" (ie, manual push button, or crank or ACC or IGN or "charging" signal) - via diodes to relay coil #86.

  4. #4
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    well yea. i know how to do hibernation... (that is what i use anyway).. but i hoped for a long shot in Sleep

  5. #5
    Constant Bitrate eugenweij's Avatar
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    sleep is possible but you will need a carpc psu , with an inverter your system will be drawing too much power to sustain sleep for extended periods
    View my worklog here

  6. #6
    The Last Good Gremlin GizmoQ's Avatar
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    Quote Originally Posted by eugenweij View Post
    sleep is possible but you will need a carpc psu , with an inverter your system will be drawing too much power to sustain sleep for extended periods
    Well there is one other option but it a long, long shot. Put an Uninterrupted Power Supply (UPS) inline between the PC and inverter. Get one with a big enough battery to power your system for however long you need and when the ignition is cut off you'll be on the UPS battery till it dies. Initiate sleep when the key is turned off, let the battery in the UPS do its thing; and when you turn the key back on, the inverter comes back on and charges the UPS battery while powering the PC.

    Some UPS have serial or USB connection with the PC and you might could use this signal as the trigger for the sleep mode instead of the relay.

    Depending on your operating system, I'd recommend you also set your Power settings to power down as much as you can as soon as you can. On my tabletPC, as soon as external power is removed several things start: within 10 seconds the audio/video player is paused, after 1 minute the screen is turned off, after 30 minutes the system goes into sleep mode, after 4 hours the system is awakened and then put into hibernation. If external power comes on anytime before the hibernation, the system is quickly on and the audio/video is resumed.
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  7. #7
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    well i hoped someone would sugget the UPS thing, becouse that is what i had originally in mind... but then i was thinking, dosent the UPS do the same thing?? use an inverter, to get the 12v of its battery at 220AC??? also, will this UPS, be able to work 24/7? (the ups in a house, normaly does not work, and when it does, its not for long. in my case, it will be almost 24/7... )

  8. #8
    FLAC SNOtwistR's Avatar
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    I use this http://store.mp3car.com/Mini_Box_pic..._p/pwr-041.htm which is almost the same as using a house ups but I find much more efficient. I use it with a 20ah sla. I think you really need to get away from the inverter, thats going to be your big power draw and really unnecessary. Grin and bear it, save your coins/dollars/euros and get a real automotive power supply and have the control you seek. Maybe another option is some sort of solar incorporated into your design. You have many options but I think the cost will end up more. Just my opinion SNO

  9. #9
    The Last Good Gremlin GizmoQ's Avatar
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    Quote Originally Posted by settra View Post
    well i hoped someone would sugget the UPS thing, becouse that is what i had originally in mind... but then i was thinking, dosent the UPS do the same thing?? use an inverter, to get the 12v of its battery at 220AC??? also, will this UPS, be able to work 24/7? (the ups in a house, normaly does not work, and when it does, its not for long. in my case, it will be almost 24/7... )
    24/7 ?????
    If you mean waiting/active 24/7 - that's the point of an UPS. Most household UPS are rated at a specific wattage and, based on the power draw of your system, will continue powering the system for a limited time.

    How long do you want your system in sleep mode? Maybe you need a second deep-cycle car battery instead of an UPS, but that means you need to fabricate isolation, charging, switching, and triggers on your own. This may give you a day, two tops.

    Nothing is going to give you 24/7 sleep mode for more than a day or two.
    HARDWARE: Fujitsu Stylistic ST5111w/WiFi and dock, internal Hitachi 500G HD, external 1TB HD, Sierra Wireless Aircard 550, DVD-RW, BoomzBox HD radio, XM Commander, Delorme GPS, Saitek X-52 Pro joystick, BluSoleil Bluetooth, TPMS, FB, Elm327

  10. #10
    Raw Wave
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    Forget a UPS - that is what you have but minus the charger (AC - rectifier/charger - DC/battery - inverter -AC).
    UPSs use batteries which are no different in capacity or density to what you are using.

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